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core: set $SYSTEMD_EXEC_PID= environment variable for executed commands

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It may be useful to detect a command is directly executed by systemd
manager, or indirectly as a child of another process.
This commit is contained in:
Yu Watanabe 2021-01-26 15:56:42 +09:00
parent d2acb93dc5
commit dc4e2940e8
2 changed files with 17 additions and 1 deletions
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11
man/systemd.exec.xml
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@ -3043,6 +3043,17 @@ StandardInputData=SWNrIHNpdHplIGRhIHVuJyBlc3NlIEtsb3BzLAp1ZmYgZWVtYWwga2xvcHAncy
</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>$SYSTEMD_EXEC_PID</varname></term>
<listitem><para>The PID of the unit process (e.g. process invoked by
<varname>ExecStart=</varname>). The child process can use this information to determine
whether the process is directly invoked by the service manager or indirectly as a child of
another process by comparing this value with the current PID (as similar to the scheme used in
<citerefentry><refentrytitle>sd_listen_fds</refentrytitle><manvolnum>3</manvolnum></citerefentry>
with <varname>$LISTEN_PID</varname> and <varname>$LISTEN_FDS</varname>).</para></listitem>
</varlistentry>
<varlistentry>
<term><varname>$TERM</varname></term>

7
src/core/execute.c
View File

@ -1794,7 +1794,7 @@ static int build_environment(
assert(p);
assert(ret);
#define N_ENV_VARS 16
#define N_ENV_VARS 17
our_env = new0(char*, N_ENV_VARS + _EXEC_DIRECTORY_TYPE_MAX);
if (!our_env)
return -ENOMEM;
@ -1950,6 +1950,11 @@ static int build_environment(
our_env[n_env++] = x;
}
if (asprintf(&x, "SYSTEMD_EXEC_PID=" PID_FMT, getpid_cached()) < 0)
return -ENOMEM;
our_env[n_env++] = x;
our_env[n_env++] = NULL;
assert(n_env <= N_ENV_VARS + _EXEC_DIRECTORY_TYPE_MAX);
#undef N_ENV_VARS